162 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 16 
present stated that an ounce of cyanide to each one hundred cubic 
feet of space had been used in their states without injurious results. 
Others present stated that two-thirds of an ounce of cyanide was the 
dosage for this class of stock in their states. Some of the entomologists 
present were of the opinion that not more than one-half of an ounce 
to each one hundred cubic feet should be used for “June-buds,” and 
said this was the dosage used in the states where they were employed. 
The discussion about the amount of cyanide to use in fumigating 
peach stock was especially interesting to me, as the State Plant Board 
of Mississippi requires the full ounce of cyanide for this class of stock 
and one of the Alabama nurserymen shipping much peach stock into 
Mississippi had protested that this large dosage would either kill or 
seriously injure “June-buds.” It seems that he based his opinions on 
statements made in a letter received from his brother, a fruit nursery¬ 
man in Colorado, who informed him that this dosage had injured peach 
trees fumigated in that state. In answer to an inquiry from me sent 
out in June relative to this matter, Mr. George M. List, the Colorado 
Inspector replied as follows: 
“This last spring we carried on a series of tests in fumigating dor¬ 
mant peach trees. This test included a variety of strengths ranging 
from three-fourths of an ounce of sodium and potassium cyanide to 
double this amount to each one hundred cubic feet of space. The 
exposure ranged from forty-five to ninety minutes. This was applied 
in both wet and dry stock. So far, one hundred percent of the trees 
are growing nicely in the nursery row.” 
The entomologists at the Atlanta meeting seemed to be agreed that 
one-half ounce of cyanide was sufficient for roses. Rose stock is not 
required to be fumigated in Mississippi except when scale is found 
on a block of stock to be offered for sale. On several occasions, San 
Jose Scale has been found on Rugosa roses in Mississippi nurseries, and 
fumigation with one-half ounce has been required. 
The most extreme view to be expressed on fumigation requirements 
at that meeting was from the representative of the Louisiana Depart¬ 
ment of Agriculture. He pointed out that they had conducted ex¬ 
periments in New Orleans in co-operation with the United States 
Bureau of Entomology and had demonstrated that the Japanese Camphor 
Scale (.Pseudaonidia duplex) could be controlled with a much lighter 
dosage than w~as being used to fumigate with in other states. Experi¬ 
ments showed that three-fourths of an ounce of cyanide to five hundred 
cubic feet was sufficient for hardy nursery stock while three-fourths of 
